Information recording processing device, information reproduction processing device, information recording medium and method, and computer program

Abstract

A device, a medium, and a method for recording and reproducing additional data difficult to analyze on an information recording medium are provided. When additional data is recorded onto the information recording medium, or additional data such for example as key information applied to a content decryption process, key generating information, content reproduction control information, or copy control information is recorded on the information recording medium, the parity of data of a recording frame in which to insert the additional data is calculated, and the value of a DC control bit in the frame in which to store the additional data is determined and set on the basis of information indicating whether the parity is even parity or odd parity and the bit value information [0] or [1] of the additional data. At a time of reproduction, the constituent bit [0] or [1] of the additional data is obtained by only detecting the parity of the recording frame.

Description

TECHNICAL FIELD [0001] The present invention relates to an information recording processing device, an information reproduction processing device, an information recording medium and a method, and a computer program. More particularly, the present invention relates to an information recording processing device, an information reproduction processing device, an information recording medium and a method, and a computer program that make it possible to record and read additional information, or various additional information such for example as key information applied to a content decryption process, content reproduction control information, or copy control information on an information recording medium on which contents such for example as image data and music data are recorded in a mode difficult to analyze by controlling the setting of DC control bits. BACKGROUND ART [0002] When data such as music data, image data and the like is recorded as digital data onto a recording medium, a r...

AI Technical Summary

Benefits of technology

[0009] The present invention has been made in view of the above problems, and it is an object of the present invention to provide an information recording processing device, an information reproduction processing device, an information recording medium and a method, and a computer program that make it possible to record various information such for example as an encryption key, encryption key generating information, content reproduction control information, content copy control information, or other content attribute information stored on a recording medium together with contents in a mode that makes it impossible to read the additional information by a general data reading process, and make unauthorized data reading difficult.

Problems solved by technology

Thus, generally, in distributing these contents, a certain use limitation is set, that is, only authorized users are permitted to use the contents so that unauthorized copying or the like is prevented.

As contents can be thus recorded easily as digital information, a problem of a flood of unauthorized copies frequently occurs, and therefore a problem of impaired interests of holders of content copyrights and distribution rights is becoming more serious.

Because of such a present situation, prevention of unauthorized copying and protection of interests of holders of content copyrights and distribution rights are an important challenge.

However, when information indicating where such an encryption key or control information is stored on an information recording medium is obtained by a user or an unauthorized contents user, the additional information can be leaked or altered.

For example, a problem of alteration of reproduction control information and copy control information or leakage of key information occurs.

When key information is leaked or control information is altered, a form of use of contents which form is based on legitimate rights to use the contents collapses, and copyrights and distribution rights of the contents are not fully protected.

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